382 



SIR THOMAS R. FRASER AND MR ALISTER T. MACKENZIE ON 



Experiment LV. — continued. 



Interval. 



Aftei- Stroyhanthus. 

 3 minutes . 



10 



15 

 20 

 25 

 30 



35 



40 



45 



50 

 52 



55 



60 



65 

 66 



70 



75 



78 

 80 



85 

 90 



110 



Contractions in 10 seconds 



Auricles. Ventricle. 



Notes. 



Contractions regular and powerful ; in systole, the ventricle 

 becomes much smaller and paler than formerly ; in diastole, 

 the ventricular movement is more abrupt ; the auricular 

 movements are strong. 



In systole, the condition of the ventricle is as last noted ; 

 in diastole, the ventricle does not dilate so much; ven- 

 tricular systole occupies two-thirds of the cycle. 



Regular contractions ; ventricular systole is as last described ; 



in diastole, the ventricle dilates only a little and its apex 



scarcely expands at all ; the auricles are acting well. 



Do. do. 



Do. do. 



Do. do. 



Ventricular systole as last described ; in diastole, the ven- 

 tricle now becomes very large ; the auricular diastolic 

 movement is also greater. 



Contractions powerful and regular in time ; ventricular 

 expansion and contraction are very large movements ; in 

 diastole, the auricles become very large and they contract 

 powerfully. 



The ventricular movements are very large and quite regular 

 in time ; there is a slight tendency for the ventricle to 

 begin contracting before its diastolic expansion is complete. 



Movements of all chambers are very large and quite regular ; 

 the ventricular systole occupies two-thirds of the cycle. 

 Do. do. 



The auricles are contracting on their contents, but do not 

 expel them ; the ventricle is arrested in systole. 



Contractions regular in time ; the auricles do not completely 

 expel their contents in systole ; they are enormous in 

 diastole ; the ventricle dilates only slightly in diastole, 

 which occupies half of the cycle. 



Contractions regular in time ; the auricles are greatly dis- 

 tended in diastole and do not expel more than half their 

 contents in systole ; ventricular diastole occupies three- 

 fourths of the ventricular cycle ; of these, two-fourths 

 occur before auricular systole ; in systole, the ventricle is 

 very small and pale. 



Do. do. 



Heart stopped beating ; all chambers were in diastole for 100 

 seconds, then regular contractions occurred spontaneously. 



Heart arrested for 50 seconds with the auricles fully dilated 

 and the ventricle partly dilated ; contractions were resumed 

 spontaneously at four per 10 seconds, the auricles contracting 

 incompletely and the ventricle completely. 



A long pause with all chambers in diastole. 



Pause of 40 seconds' duration as above, and then spontaneous 



contractions at four per 10 seconds. 

 Pause and recovery as in last note. 

 The movements had the same characters as at 60 minutes 



after poisoning. 

 As in last note. 



